Hi, I ran into a similar problem with the Brocade 1010 and 1020 CNAs, see http://brasstacksblog.typepad.com/brass-tacks/2011/06/interoperability-issue-between-brocade-cna-and-cisco-nexus-5596.html . The resolution was to upgrade to CNA driver 3.0.3....
It sounds like you have an issue with FIP Keep Alive. If the 5548 does not recieve a keep alive within 2.5 times the Keep Alive Timeout value, it will log the end device out. Since you are saying it happens after a few minutes, this could mean the V...